"Mr. Neuhaus himself preferred the term “sound installations” for the nonvisual artworks he created from electronically generated sounds emanating from an invisible source at a particular location. He worked, he said, from the premise that a person’s sense of place is determined by what he hears as well as by what he sees, and his art argued that a place can be denoted and described as definitively by the sound that fills it up as by a set of walls."
Max Neuhaus, Who Made Aural Artwork, Dies at 69Max Neuhaus Wikipedia.org entry